Re: [PATCH] KVM: x86: Fix page-tables reserved bits

[Marcelo Tosatti]

On Wed, Apr 16, 2014 at 02:17:08PM -0700, H. Peter Anvin wrote:
> On 04/16/2014 12:03 PM, Marcelo Tosatti wrote:
> >> @@ -3550,9 +3550,9 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
> >>  		break;
> >>  	case PT64_ROOT_LEVEL:
> >>  		context->rsvd_bits_mask[0][3] = exb_bit_rsvd |
> >> -			rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8);
> >> +			rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7);
> >>  		context->rsvd_bits_mask[0][2] = exb_bit_rsvd |
> >> -			rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8);
> >> +			rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7);
> > 
> > Bit 7 is not reserved either, for the PDPTE (its PageSize bit).
> > 
> 
> In long mode (IA-32e), bit 7 is definitely reserved.
> 
> 	-hpa

There is a separate reserved mask for PS=1, nevermind.

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